Just my 2 cents worth, and i havent had a massive exposure to many variants of Decaf but i will share what i know at this stage,
I bought about 5kgs of Mexico Decaf from Di Bella, they told me that it will roast about 10C hotter than average and will look about CS 12 at second crack with alot of shine, not oil but shine in the bean,
So off i went to roast this bean, first crack a little hard to hear, but SC was quite loud and fortunately i was brave enough to listen for SC and not get too concerned about the colour and look of the bean, as it was as i said about CS12 (very dark) at SC, it is an amazing bean with incredible body with some lovely chocolate flavors pulled just after SC!
So to Conclude,
Roasts about 10C hotter
Roasts Dark and shiney
You will get a tonne of info from the experts here, this place is an amazing source of info on all things coffee.
Best of luck!